# word = "学生姓名叫李小明,班级是24人工智智能激素高级5年1班"
# new_word = word.replace("24","20")
# print(new_word)

word1 = "燕子去了，有再来的时候；杨柳枯了，有在青的时候；桃花谢了，有再开的时候"
new_word2 = word1.replace("杨柳","荷花")
new_word3 = new_word2.replace("桃花","木棉花")
print(new_word3)